Update tables.md : add an additional resource

[KarmaJaneK]

Because

I added the Codecademy html tables lesson as I believe having a interactive resources for practicing basic syntax would be beneficial.

This PR

• added a link to Codeademy's 'HTML Tables' lesson, under the additional resources section.
• added description of the added lesson

Issue

Additional Information

Pull Request Requirements

• I have thoroughly read and understand The Odin Project curriculum contributing guide
• The title of this PR follows the location of change: brief description of change format, e.g. Intro to HTML and CSS lesson: Fix link text
• The Because section summarizes the reason for this PR
• The This PR section has a bullet point list describing the changes in this PR
• If this PR addresses an open issue, it is linked in the Issue section
• If any lesson files are included in this PR, they have been previewed with the Markdown preview tool to ensure it is formatted correctly
• If any lesson files are included in this PR, they follow the Layout Style Guide